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	Provedor de dados ArchiMer (2) Autor Ba, Sileye O. (2) Chapron, Bertrand (2) Fablet, Ronan (2) Autret, Emmanuelle (1) Corpetti, Thomas (1) Palavra-chave Assimilation variationnelle de données (1) Data assimilation (1) Geophysical tracers dynamics (1) Geosciences and remote sensing (1) Image analysis (1) Image classification (1) Image processing (1) Inpainting. (1) Interpolation de données manquantes (1) Missing data interpolation (1) Multimodal interpolation (1) Ocean temperature (1) Oceans (1) Sea surface (1) Variational method (1) Mais... Tipo do documento Text (2) Ano 2012 (2) País France (2) Idioma Francês (1) Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Interpolation par assimilation variationnelle de séquences multimodales d’images satellitaires de l’océan ArchiMer Ba, Sileye O.; Corpetti, Thomas; Chapron, Bertrand; Fablet, Ronan. In this paper we address the problem of missing data interpolation in multi-modal geophysical satellite observation sequences. Main issues relate to the large percentage of missing data, from 20 % to 90 % for daily high-resolution observations; and the requirement for reconstructing fine-scale structures in accordance with the underlying turbulent dynamics. To solve the missing data interpolation problem, a variational data assimilation model is developped. Using synthetic and real ocean surface observations, numerical and qualitative evaluations demonstrate the relevance of two key components of the proposed model: the fusion of multi-modal observations through a geometric front-driven constraint and the proposed variational assimilation setting using an... Tipo: Text Palavras-chave: Assimilation variationnelle de données; Interpolation de données manquantes; Inpainting.; Data assimilation; Variational method; Missing data interpolation; Geophysical tracers dynamics; Multimodal interpolation. Ano: 2012 URL: http://archimer.ifremer.fr/doc/00139/24980/23061.pdf Statistical Descriptors of Ocean Regimes From the Geometric Regularity of SST Observations ArchiMer Ba, Sileye O.; Autret, Emmanuelle; Chapron, Bertrand; Fablet, Ronan. In this letter, we evaluate to which extent the activity of ocean fronts can be retrieved from the geometric regularity of ocean tracer observations. Applied to sea surface temperature (SST), we propose a method for the characterization of this geometric regularity from curvature-based statistics along temperature level lines in front regions. To assess the effectiveness of the proposed descriptors, we used six years (from 2003 to 2008) of daily SST observations of the regions of Agulhas in the South of Africa and of Malvinas off the southern Brazilian coast. These experiments stress the relevance of geometric regularity features of tracer observation at ocean surface to characterize seasonal variations in ocean regimes. Tipo: Text Palavras-chave: Geosciences and remote sensing; Image analysis; Image classification; Image processing; Oceans; Ocean temperature; Sea surface. Ano: 2012 URL: http://archimer.ifremer.fr/doc/00109/21993/20230.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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